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Math Help - A few circle theorem questions (having a bit of trouble)

  1. #1
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    A few circle theorem questions (having a bit of trouble)

    I have a sheet of questions on circle theorems. I did most of them but some of them I don't know what to do.

    I know the basic rules:

    1) The angle at the centre of the circle is double the angle at the circumference standing on the same arc
    2) The angle in a semicircle is right angle or 90 degrees
    3) Angles at the circumference of the circle standing on thee same arc are equal
    4) The opposite angles of a cyclic quadrilateral are supplementary.

    I haven't got up to tangent and chords yet. Just these for now.



    Thanks in advance!!
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  2. #2
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    In some diagrams, whether the arrow marked lines are parallel?
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  3. #3
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    Umm.. Sorry, I didn't really understand that post
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  4. #4
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    Quote Originally Posted by jgv115 View Post
    Umm.. Sorry, I didn't really understand that post
    In the figure 8 and 14, two lines are arrow marked. Are they parallel?
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  5. #5
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    Yes!
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